diff --git a/Lecture/Lecture/Lecture.csproj b/Lecture/Lecture/Lecture.csproj
index 57f2c34a..9e9fd39d 100644
--- a/Lecture/Lecture/Lecture.csproj
+++ b/Lecture/Lecture/Lecture.csproj
@@ -62,7 +62,7 @@
     <Compile Include="LessonExtensionMethods\IMyInterface.cs" />
     <Compile Include="LessonGenerics\Generics.cs" />
     <Compile Include="InterfaceExample.cs" />
-    <Compile Include="LessonGenerics\NodeObservable.cs" />
+    <Compile Include="LessonGenerics\NodeEnumerable.cs" />
     <Compile Include="LinqExtensions.cs" />
     <Compile Include="LessonGenerics\Node.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
diff --git a/Lecture/Lecture/LessonGenerics/Generics.cs b/Lecture/Lecture/LessonGenerics/Generics.cs
index d4ab2f05..c8260134 100644
--- a/Lecture/Lecture/LessonGenerics/Generics.cs
+++ b/Lecture/Lecture/LessonGenerics/Generics.cs
@@ -33,7 +33,6 @@ public MethodType GenericMethod<MethodType>(MethodType methodTypeParameter)
     {
       return methodTypeParameter;
     }
-
   }
 
   public class SelfDictionary<Type> : Dictionary<Type, Type>
diff --git a/Lecture/Lecture/LessonGenerics/Node.cs b/Lecture/Lecture/LessonGenerics/Node.cs
index 1c81e6ff..5fc589ba 100644
--- a/Lecture/Lecture/LessonGenerics/Node.cs
+++ b/Lecture/Lecture/LessonGenerics/Node.cs
@@ -1,11 +1,11 @@
 namespace TP.Lecture.LessonGenerics
 {
-  class Node<ClassA>
+  public class Node<ValueTypeParameter>
   {
-    public Node<ClassA> Next { get; private set; }
-    public static Node<ClassA> First { get; private set; } = null;
-    public ClassA Value { get; private set; }
-    public Node(ClassA value)
+    public Node<ValueTypeParameter> Next { get; private set; }
+    public static Node<ValueTypeParameter> First { get; private set; } = null;
+    public ValueTypeParameter Value { get; private set; }
+    public Node(ValueTypeParameter value)
     {
       Value = value;
       Next = First;
diff --git a/Lecture/Lecture/LessonGenerics/NodeEnumerable.cs b/Lecture/Lecture/LessonGenerics/NodeEnumerable.cs
new file mode 100644
index 00000000..87b29a18
--- /dev/null
+++ b/Lecture/Lecture/LessonGenerics/NodeEnumerable.cs
@@ -0,0 +1,30 @@
+
+using System.Collections;
+using System.Collections.Generic;
+
+namespace TP.Lecture.LessonGenerics
+{
+  public class NodeEnumerable<ValueTypeParameter> : Node<ValueTypeParameter>, IEnumerable<ValueTypeParameter>
+  {
+    public NodeEnumerable(ValueTypeParameter value) : base(value) {  }
+
+    #region IEnumerable<TypeParameter>
+    public IEnumerator<ValueTypeParameter> GetEnumerator()
+    {
+      Node<ValueTypeParameter> _current = First;
+      while (_current != null)
+      {
+        ValueTypeParameter _value = _current.Value;
+        _current = _current.Next;
+        yield return _value;
+      }
+    }
+    IEnumerator IEnumerable.GetEnumerator()
+    {
+      return this.GetEnumerator();
+    }
+    #endregion
+
+  }
+
+}
diff --git a/Lecture/Lecture/LessonGenerics/NodeObservable.cs b/Lecture/Lecture/LessonGenerics/NodeObservable.cs
deleted file mode 100644
index 9a1d583a..00000000
--- a/Lecture/Lecture/LessonGenerics/NodeObservable.cs
+++ /dev/null
@@ -1,38 +0,0 @@
-
-using System.Collections;
-using System.Collections.Generic;
-
-namespace TP.Lecture.LessonGenerics
-{
-  public class NodeEnumerable<TypeParameter> : IEnumerable<TypeParameter>
-  {
-    public NodeEnumerable<TypeParameter> Next { get; private set; }
-    public static NodeEnumerable<TypeParameter> First { get; private set; } = null;
-    public TypeParameter Value { get; private set; }
-    public NodeEnumerable(TypeParameter value)
-    {
-      Value = value;
-      Next = First;
-      First = this;
-    }
-
-    #region IEnumerable<TypeParameter>
-    public IEnumerator<TypeParameter> GetEnumerator()
-    {
-      NodeEnumerable<TypeParameter> _current = First;
-      while (_current != null)
-      {
-        TypeParameter _value = _current.Value;
-        _current = _current.Next;
-        yield return _value;
-      }
-    }
-    IEnumerator IEnumerable.GetEnumerator()
-    {
-      return this.GetEnumerator();
-    }
-    #endregion
-
-  }
-
-}